/*
 * Copyright 2010, 2011 Matt Oliveri
 *
 * This file is part of JConfigGen
 *
 * JConfigGen is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * JConfigGen is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with JConfigGen.  If not, see <http://www.gnu.org/licenses/>.
 */

package atma.jconfiggen;

import java.io.PrintStream;

/** Common abstract superclass of expression types whose instances can be assigned ids.
 */
public abstract class IdExpr extends Expr
{
	static final String none = "<discarded>";

	final void printDecl(PrintStream out) throws InvalidConfigException
	{
		out.print("final ");
		printType(out);
		out.print(' ');
		out.print(id);
	}

	private final Config config;

	String id;
	boolean oldId;

	IdExpr(Config c,String i) {config = c;id = i;}

	void discard() {if (id == null) id = none;}
	void statize() {if (id == null) id = config.genTemp();}

	boolean useId(String i)
	{
		if (id != null) return false;
		id = i;
		oldId = true;
		return true;
	}
}
